Occurrence of photoinduced charge separation by the modulation of the electronic coupling between pyrene dimers and chemically converted graphenes

2017 ◽  
Vol 53 (6) ◽  
pp. 1025-1028 ◽  
Author(s):  
Tomokazu Umeyama ◽  
Jinseok Baek ◽  
Junya Mihara ◽  
Nikolai V. Tkachenko ◽  
Hiroshi Imahori
Keyword(s):  
Charge Separation ◽  
Electronic Coupling ◽  
Exciplex Formation ◽  
Photoinduced Charge Separation ◽  
A Charge ◽  
Photoinduced Charge

The photoexcitation of the pyrene dimer on graphene resulted in the final formation of a charge-separated (CS) state following an exciplex formation, while that of the pyrene monomer on graphene generated the corresponding exciplex solely.

scholarly journals Direct estimation of the transfer integral for photoinduced electron transfer from TD DFT calculations

2017 ◽  
Vol 19 (46) ◽  
pp. 31007-31010 ◽  
Author(s):  
Lluís Blancafort ◽  
Alexander A. Voityuk
Keyword(s):  
Electron Transfer ◽  
Dft Calculations ◽  
Charge Separation ◽  
Photoinduced Electron Transfer ◽  
Simple Approach ◽  
Electronic Coupling ◽  
Td Dft ◽  
Photoinduced Charge Separation ◽  
Transfer Integral ◽  
Photoinduced Charge

A simple approach to estimate the electronic coupling for photoinduced charge separation in materials and biomolecules is proposed.

Photoinduced charge separation in a carotenoid-porphyrin-diquinone tetrad: enhancement of quantum yields via control of electronic coupling

1993 ◽  
Vol 176 (2-3) ◽  
pp. 321-336 ◽  
Author(s):  
Seung-Joo Lee ◽  
Janice M. DeGraziano ◽  
Alisdair N. Macpherson ◽  
Eun-Ju Shin ◽  
Pamela K. Kerrigan ◽  
...  
Keyword(s):  
Charge Separation ◽  
Quantum Yields ◽  
Electronic Coupling ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Increasing the Yield of Photoinduced Charge Separation through Parallel Electron Transfer Pathways

1999 ◽  
Vol 03 (01) ◽  
pp. 32-44 ◽  
Author(s):  
NYANGENYA I. MANIGA ◽  
JOHN P. SUMIDA ◽  
SIMON STONE ◽  
ANA L. MOORE ◽  
THOMAS A. MOORE ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Quantum Yield ◽  
Charge Separation ◽  
Charge Recombination ◽  
Final State ◽  
Photoinduced Charge Separation ◽  
Electron Transfer Pathways ◽  
Artificial Photosynthetic ◽  
A Charge ◽  
Photoinduced Charge

A strategy for increasing the yield of long-lived photoinduced charge separation in artificial photosynthetic reaction centers which is based on multiple electron transfer pathways operating in parallel has been investigated. Excitation of the porphyrin moiety of a carotenoid ( C )–porphyrin ( P )–naphthoquinone (Q) molecular triad leads to the formation of a charge-separated state C ·+– P – Q ·− with an overall quantum yield of 0.044 in benzonitrile solution. Photoinduced electron transfer from the porphyrin first excited singlet state gives C – P ·+– Q ·− with a quantum yield of ~1.0. However, electron transfer from the carotenoid to the porphyrin radical cation to form the final state does not compete well with charge recombination of C – P ·+– Q ·−, reducing the yield. The related pentad C 3– P – Q features carotenoid, porphyrin and quinone moieties closely related to those in the triad. Excitation of this molecule gives a C ·+– P ( C 2)– Q ·− state with a quantum yield of 0.073. The enhanced yield is ascribed to the fact that three electron donation pathways operating in parallel compete with charge recombination. The yield does not increase by the statistically predicted factor of three owing to small differences in thermodynamic driving force between the two compounds.

Electron transfer and exciplex chemistry of functionalized nanocarbons: effects of electronic coupling and donor dimerization

2018 ◽  
Vol 3 (4) ◽  
pp. 352-366 ◽  
Author(s):  
Tomokazu Umeyama ◽  
Hiroshi Imahori
Keyword(s):  
Electron Transfer ◽  
Solar Energy ◽  
Energy Conversion ◽  
Charge Separation ◽  
Artificial Photosynthesis ◽  
Solar Energy Conversion ◽  
Electronic Coupling ◽  
The Past ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

In the past few decades, research on the construction of donor–bridge–acceptor linked systems capable of efficient photoinduced charge separation has fundamentally contributed to the fields of artificial photosynthesis and solar energy conversion.

Anionic Fluorinated Zn-porphyrin Combined with Cationic Endohedral Li-fullerene for Long-Lived Photoinduced Charge Separation with Low Energy Loss

2021 ◽  
Vol 125 (3) ◽  
pp. 918-925
Author(s):  
Kazuhira Miwa ◽  
Shinobu Aoyagi ◽  
Takahiro Sasamori ◽  
Hiroshi Ueno ◽  
Hiroshi Okada ◽  
...  
Keyword(s):  
Energy Loss ◽  
Charge Separation ◽  
Low Energy ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge

Photoinduced charge separation in microporous and mesoporous materials

2011 ◽  
Vol 89 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Ranjit T. Koodali
Keyword(s):  
Mesoporous Materials ◽  
Charge Separation ◽  
Organic Molecules ◽  
Microporous Materials ◽  
Photoinduced Charge Separation ◽  
Photoinduced Charge ◽  
Mcm 41

A review of photoinduced charge separation of organic molecules in microporous and mesoporous materials is presented. In particular, the photoionization of N-alkylphenothiazine (PCn), N,N,N′,N′-tetramethylbenzidine (TMB), and porphyrin in microporous materials, such as zeolites, aluminophosphates (AlPOs), silicoaluminophosphates (SAPOs), and mesoporous materials, such as MCM-41, MCM-48, and SBA-15, is discussed.

Photoinduced charge separation in self-assembled cofacial pentamers of zinc-5,10,15,20-tetrakis(perylenediimide)porphyrin

2007 ◽  
Vol 9 (12) ◽  
pp. 1469 ◽  
Author(s):  
Michael J. Ahrens ◽  
Richard F. Kelley ◽  
Zachary E. X. Dance ◽  
Michael R. Wasielewski
Keyword(s):  
Charge Separation ◽  
Photoinduced Charge Separation ◽  
Self Assembled ◽  
Photoinduced Charge

The direct observation of charge separation dynamics in CdSe quantum dots/cobaloxime hybrids

2016 ◽  
Vol 18 (6) ◽  
pp. 4300-4303 ◽  
Author(s):  
J. Huang ◽  
Y. Tang ◽  
K. L. Mulfort ◽  
X. Zhang
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Charge Separation ◽  
Cdse Quantum Dots ◽  
X Ray ◽  
Molecular Catalyst ◽  
Cdse Quantum Dot ◽  
Photoinduced Charge Separation ◽  
X Ray Absorption ◽  
Photoinduced Charge

In this work, we investigated photoinduced charge separation dynamics in a CdSe quantum dot/cobaloxime molecular catalyst hybrid using the combination of transient optical (OTA) and X-ray absorption (XTA) spectroscopy.

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